1
\$\begingroup\$

I have these AFB0824GHE-R00 Fans in my hands, and I see that there are three wires on that fan. The + and -, and the third blue wire, which according to the datasheet's hint is a function wire?

fan function wire

function type

I am not sure how to use it. If I let it floating, the fans work as normal (I connect + and - to 24V and they spin), and I havent connect the blue wire to any voltage potential, as I may fry the fans by mistake.

So is this a wire that activates a "function" mode of the fan?

Where should I connect this wire to enable this mode, and what this mode does?

\$\endgroup\$
3
  • 1
    \$\begingroup\$ The datasheet does mention it. That link is just not the datasheet, but just some sales brochure. \$\endgroup\$
    – Justme
    Sep 9, 2021 at 8:27
  • 1
    \$\begingroup\$ @Justme yup, you're right. This one does mention it. \$\endgroup\$ Sep 9, 2021 at 8:28
  • 2
    \$\begingroup\$ Rotation detection R, open collector 00 \$\endgroup\$
    – Kartman
    Sep 9, 2021 at 8:29

1 Answer 1

6
\$\begingroup\$

According to the fan datasheet, that specific model has a motor lock detection, and the third wire is an open collector output of the lock detector.

It will be pulled low when motor runs, and high-z when motor is locked. Max ratings for external pull-up voltage and current are 26.4V and 5 mA.

If you don't intend to use the lock detection output, you don't need to connect it in any way.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.